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冻融条件下桩基侧摩阻力模型试验研究

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Keywords: 道路工程,桩基,冻融循环,侧摩阻力,模型桩,本构关系

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Abstract:

基于自制的冻融循环模型桩试验系统,对桩土间土体融沉引起的桩侧摩阻力进行了室内试验,主要研究了不同含水率土体中模型桩在冻结温度分别为-1,-2,-5℃和-10℃时桩侧摩阻力的变化规律。结果表明桩侧摩阻力在一定范围内随冻结温度降低而增大;桩侧摩阻力随土体含水率的变化而变化且存在一个界限含水率,低于界限含水率时,侧摩阻力随含水率的增大而增大,反之则随含水率的增大而降低。最后,联系温度与含水率对桩侧摩阻力的作用关系,基于荷载传递法,提出了考虑温度影响因子的冻融土体中桩侧摩阻力计算模型,并以沈阳地铁中段DK11+685联络站建设工程为例,对施工过程中的桩基受力情况做了现场监测。数值计算结果与现场监测结果吻合程度较好,验证了所建立本构关系模型的有效性。

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